Show HN: wcwidth-o1 – Find Unicode text cell width in no time for JavaScript/TS • Hacker News Board

Show HN: wcwidth-o1 – Find Unicode text cell width in no time for JavaScript/TS

#1

Post by dawson0 » Sat, Sep 13, 2025, 2:53 AM UTC

I ported Markus Kuhn’s wcwidth to TypeScript and optimized it with bitset lookups for O(1) performance. It now covers the full Unicode 15.1 combining ranges.

GitHub: https://github.com/dawsonhuang0/Wcwidth-O1 NPM: https://www.npmjs.com/package/wcwidth-o1

Feedback welcome!

Show HN: wcwidth-o1 – Find Unicode text cell width in no time for JavaScript/TS
github.com

Re: Show HN: wcwidth-o1 – Find Unicode text cell width in no time for JavaScript/TS

#2

Post by peter-m80 » Sat, Sep 13, 2025, 4:51 AM UTC

Nice

Re: Show HN: wcwidth-o1 – Find Unicode text cell width in no time for JavaScript/TS

#3

Post by jv22222 » Sat, Sep 13, 2025, 5:52 AM UTC

I was about to say you could figure this kind of thing out with Intl.Segmenter but then saw it was a different problem. Nice.

Re: Show HN: wcwidth-o1 – Find Unicode text cell width in no time for JavaScript/TS

#4

Post by shawn_w » Sat, Sep 13, 2025, 7:52 AM UTC

Now you just have to update it to the just-released Unicode 17.

Re: Show HN: wcwidth-o1 – Find Unicode text cell width in no time for JavaScript/TS

#5

Post by dawson0 » Mon, Sep 15, 2025, 3:25 PM UTC

shawn_w wrote: post #4

Now you just have to update it to the just-released Unicode 17.

Thanks for pointing it out! The latest version is now based on Unicode 17.0.0.